Report of a novel mutation in CRB1 in a Lebanese family presenting retinal dystrophy.

Abstract:

PURPOSE:To identify the genetic basis of a recessive inheritance form of retinal dystrophy (RD) in a Lebanese family. MATERIALS AND METHODS:Clinical data were recorded for five patients of the 14 family members. Genetic linkage was carried out using Affymetrix 250 K Nspl SNP array followed by sequencing. RESULTS:The patients showed variable phenotypes ranging from Leber Congenital Amaurosis (LCA) to progressive forms of Retinitis Pigmentosa (RP). A 46.1 Mb chromosomal region at chromosome 1q23.3-32.2 was identified by homozygosity mapping. This region contained the Crumbs homologue-1, CRB1, a gene responsible for recessive retinal dystrophies. CRB1 is required for photoreceptor morphogenesis, and it has been associated with RP and LCA. Sequencing of CRB1 revealed two mutations: a novel deletion in exon 6 (c.1772_1775delGCAT; p.C591Sfs*28) and a missense mutation in exon 7 (c.2234C > T; p.T745M). CONCLUSION:We report a novel CRB1 mutation in inherited RD in a Lebanese family, and confirm the considerable phenotype heterogeneity that may exist between individuals sharing the same mutations.

journal_name

Ophthalmic Genet

journal_title

Ophthalmic genetics

authors

Jalkh N,Guissart C,Chouery E,Yammine T,El Ali N,Farah HA,Mégarbané A

doi

10.3109/13816810.2013.763995

subject

Has Abstract

pub_date

2014-03-01 00:00:00

pages

57-62

issue

1

eissn

1381-6810

issn

1744-5094

journal_volume

35

pub_type

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